core

#### GD&T Standard

GD&T Standard area - From the list in this area on the Feature Control Frame tab in the XactMeasure GD&T dialog box (Insert | Dimension | <dimension>), you can choose the type of GD&T standard to use for your Feature Control Frame (FCF) dimension. Available options include ISO 1101, ASME Y14.5, and Custom.

If you select ISO 1101 or ASME Y14.5, PC-DMIS changes different GD&T settings and calculations so that it follows the selected standard. If you do something that extends or customizes the previous selected standard, PC-DMIS automatically selects Custom.

ISO 1101

When you select to follow this standard, PC-DMIS applies the following changes:

- It calculates the profile deviation as two times the max deviation.

- It clears the Deviation Perpto Centerline check box by default. You can later select the check box if desired.

- It selects the Fit to Datums check box by default. If you then clear this check box, the drop-down list changes to Custom.

- It calculates Axial/Radial runout according to this standard.

- Concentricity and Coaxiality support material condition modifiers (MMC/LMC) for the considered feature but not the datum features.

- Symmetry is only RFS for both the considered feature and datums.

- Material condition symbols are (for MMC), (for LMC), and a blank (for RFS).

- If you choose the Position symbol for an Auto Cylinder feature, it displays the Local Size list. For more information, see "Local Size List".

ASME Y14.5

When you select to follow this standard, PC-DMIS applies the following changes:

- It calculates the profile deviation as (max deviation - min deviation).

- It selects the Deviation Perpto Centerline check box by default. You can later clear the check box if desired.

- It selects the Fit to Datums check box by default. If you then clear this check box, the drop-down list changes to Non-Standard.

- It calculates Axial/Radial runout according to this standard.

- Concentricity, Coaxiality, and Symmetry are only at RFS for both considered feature and datums.

- Material condition symbols are (for MMC), (for LMC), and a blank or (for RFS).

Custom

Selecting this doesn't follow a particular standard, so nothing is really changed. However, PC-DMIS changes the drop-down list to Custom and makes the other items unavailable, if you do any of the following:

- Attempt to dimension the parallelism of a plane with a projection length/width or diameter

- Clear the Fit to Datums check box

- Select the R symbol in the size tolerance for a position dimension.

- Prior to version 2014.1, to report local size, you selected the ISO 8015 standard. In version 2014.1, ISO 8015 was removed from the GD&T Standards list. To report on local size, from the GD&T Standards list, select ISO 1101 to display the Local Size list. From the Local Size list, select Local: MAX & MIN. For more information, see "Local Size List".

- To set the standard used for legacy dimensions, you can use the UseISOCalculations registry entry. For more information, see "Dimensioning Profile - Line or Surface" in the "Using Legacy Dimensions" chapter.